15,230 research outputs found
Moment Analysis and Zipf Law
The moment analysis method and nuclear Zipf's law of fragment size
distributions are reviewed to study nuclear disassembly. In this report, we
present a compilation of both theoretical and experimental studies on moment
analysis and Zipf law performed so far. The relationship of both methods to a
possible critical behavior or phase transition of nuclear disassembly is
discussed. In addition, scaled factorial moments and intermittency are
reviewed.Comment: Caption of Fig.6 was corrected. Review paper for WCI (World Consensus
Initiative) Book "Dynamics and Thermodynamics with Nuclear Degrees of
Freedom", published in Euorpean Physics Journal A as part of the Topical
Volume. 16 pages, 21 figure
Information entropy in fragmenting systems
The possibility of facing critical phenomena in nuclear fragmentation is a
topic of great interest. Different observables have been proposed to identify
such a behavior, in particular, some related to the use of information entropy
as a possible signal of critical behavior. In this work we critically examine
some of the most widespread used ones comparing its performance in bond
percolation and in the analysis of fragmenting Lennard Jones Drops.Comment: 3 pages, 3 figure
2-AminoÂterephthalic acidâ4,4âČ-bipyridine (1/1)
The asymmetric unit of the title compound, C10H8N2·C8H7NO4, contains two half-molÂecules, which constitute a 1:1 co-crystal. The 2-aminoÂterephthalic acid molÂecule is situated on an inversion center being disordered between two orientations in a 1:1 ratio. In the 4,4âČ-bipyridine molÂecule, which is situated on a twofold rotational axis, the two pyridine rings form a dihedral angle of 37.5â
(1)°. In the crystal, molÂecules are held together via interÂmolecular NâHâŻO and OâHâŻN hydrogen bonds. The crystal packing exhibits ÏâÏ interÂactions between the aromatic rings with a centroidâcentroid distance of 3.722â
(3)â
Ă
HyperINR: A Fast and Predictive Hypernetwork for Implicit Neural Representations via Knowledge Distillation
Implicit Neural Representations (INRs) have recently exhibited immense
potential in the field of scientific visualization for both data generation and
visualization tasks. However, these representations often consist of large
multi-layer perceptrons (MLPs), necessitating millions of operations for a
single forward pass, consequently hindering interactive visual exploration.
While reducing the size of the MLPs and employing efficient parametric encoding
schemes can alleviate this issue, it compromises generalizability for unseen
parameters, rendering it unsuitable for tasks such as temporal
super-resolution. In this paper, we introduce HyperINR, a novel hypernetwork
architecture capable of directly predicting the weights for a compact INR. By
harnessing an ensemble of multiresolution hash encoding units in unison, the
resulting INR attains state-of-the-art inference performance (up to 100x higher
inference bandwidth) and can support interactive photo-realistic volume
visualization. Additionally, by incorporating knowledge distillation,
exceptional data and visualization generation quality is achieved, making our
method valuable for real-time parameter exploration. We validate the
effectiveness of the HyperINR architecture through a comprehensive ablation
study. We showcase the versatility of HyperINR across three distinct scientific
domains: novel view synthesis, temporal super-resolution of volume data, and
volume rendering with dynamic global shadows. By simultaneously achieving
efficiency and generalizability, HyperINR paves the way for applying INR in a
wider array of scientific visualization applications
Photometric observations of selected, optically bright quasars for Space Interferometry Mission and other future celestial reference frames
Photometric observations of 235 extragalactic objects that are potential
targets for the Space Interferometry Mission (SIM) are presented. Mean B, V, R,
I magnitudes at the 5% level are obtained at 1 - 4 epochs between 2005 and 2007
using the 1-m telescopes at Cerro Tololo Inter-American Observatory and Naval
Observatory Flagstaff Station. Of the 134 sources which have V magnitudes in
the Veron & Veron-Cetty catalog a difference of over 1.0 mag is found for the
observed-catalog magnitudes for about 36% of the common sources, and 10 sources
show over 3 mag difference. Our first set of observations presented here form
the basis of a long-term photometric variability study of the selected
reference frame sources to assist in mission target selection and to support in
general QSO multi-color photometric variability studies.Comment: 40 pages, 13 figures, 4 table
Transverse Momentum Dependent Light-Cone Wave Function of B-Meson and Relation to the Momentum Integrated One
A direct generalization of the transverse momentum integrated(TMI) light-cone
wave function to define a transverse momentum dependent(TMD) light-cone wave
function will cause light-cone singularities and they spoil TMD factorization.
We motivate a definition in which the light-cone singularities are regularized
with non-light like Wilson lines. The defined TMD light-cone wave function has
some interesting relations to the corresponding TMI one. When the transverse
momentum is very large, the TMD light-cone wave function is determined
perturbatively in term of the TMI one. In the impact -space with a small
, the TMD light-cone wave function can be factorized in terms of the TMI
one. In this letter we study these relations. By-products of our study are the
renormalization evolution of the TMI light-cone wave function and the
Collins-Soper equation of the TMD light-cone wave function, the later will be
useful for resumming Sudakov logarithms.Comment: Minor change in text, 7 pages, two figure
Preliminary results using a P300 brain-computer interface speller: a possible interaction effect between presentation paradigm and set of stimuli
FernĂĄndez-RodrĂguez Ă., Medina-JuliĂĄ M.T., Velasco-Ălvarez F., Ron-Angevin R. (2019) Preliminary Results Using a P300 Brain-Computer Interface Speller: A Possible Interaction Effect Between Presentation Paradigm and Set of Stimuli. In: Rojas I., Joya G., Catala A. (eds) Advances in Computational Intelligence. IWANN 2019. Lecture Notes in Computer Science, vol 11506. Springer, ChamSeveral proposals to improve the performance controlling a P300-based BCI speller have been studied using the standard row-column presentation (RCP) par-adigm. However, this paradigm could not be suitable for those patients with lack of gaze control. To solve that, the rapid serial visual presentation (RSVP) para-digm, which presents the stimuli located in the same position, has been proposed in previous studies. Thus, the aim of the present work is to assess if a stimuli set of pictures that improves the performance in RCP, could also improve the per-formance in a RSVP paradigm. Six participants have controlled four conditions in a calibration task: letters in RCP, pictures in RCP, letters in RSVP and pictures in RSVP. The results showed that pictures in RCP obtained the best accuracy and information transfer rate. The improvement effect given by pictures was greater in the RCP paradigm than in RSVP. Therefore, the improvements reached under RCP may not be directly transferred to the RSVP.Universidad de MĂĄlaga. Campus de Excelencia Internacional AndalucĂa Tech
Risk Factors Associated with Opioid Use Among African American Faith-Based Populations
African Americans (AAs) in the Midwest are more likely to die from an opioid overdose compared to Whites, despite lower rates of use. Little is known about factors related to opioid use among AAs residing in the Midwest, particularly church-affiliated AAs. AAs have the highest rate of church attendance among all racial/ethnic groups, and the Black Church may be an appropriate setting for prevention efforts. The present study sought to better understand factors related to opioid use among Midwestern church-affiliated AAs to inform future faith-based interventions. This study examined predictors of opioid use (ever) using survey data from Taking It to the Pews (TIPS), a faith-based HIV/STD/hepatitis C virus (HCV) education and testing intervention conducted in 4 AA churches (N = 250) in the Kansas City metropolitan area. Participants were predominantly female (71%) and church members (74%), with an average age of 47. Fifty-three percent of participants reported prescription opioid use at some point in their lifetime. Logistic regression analyses indicated that those who reported opioid use in their lifetime attended church more frequently, less likely to be on Medicaid, had a history of severe pain, a history of illicit drug use, and a history of marijuana use. AA churches are in a uniquely positioned to reach church congregants and community members utilizing church outreach services. AA churches may benefit from offering lifestyle interventions, such as exercise classes and stress management programs, for pain management and to prevent misuse of prescription opioids
Recommended from our members
Impact of the earthworm Lumbricus terrestris (L.) on As, Cu, Pb and Zn mobility and speciation in contaminated soils
To assess the risks that contaminated soils pose to the environment properly a greater understanding of how soil biota influence the mobility of metal(loid)s in soils is required. Lumbricus terrestris L. were incubated in three soils contaminated with As, Cu, Pb and Zn. The concentration and speciation of metal(loid)s in pore waters and the mobility and partitioning in casts were compared with earthworm-free soil. Generally the concentrations of water extractable metal(loid)s in earthworm casts were greater than in earthworm-free soil. The impact of the earthworms on concentration and speciation in pore waters was soil and metal specific and could be explained either by earthworm induced changes in soil pH or soluble organic carbon. The mobilisation of metal(loid)s in the environment by earthworm activity may allow for leaching or uptake into biota
Construction of -strong Feller Processes via Dirichlet Forms and Applications to Elliptic Diffusions
We provide a general construction scheme for -strong Feller
processes on locally compact separable metric spaces. Starting from a regular
Dirichlet form and specified regularity assumptions, we construct an associated
semigroup and resolvents of kernels having the -strong Feller
property. They allow us to construct a process which solves the corresponding
martingale problem for all starting points from a known set, namely the set
where the regularity assumptions hold. We apply this result to construct
elliptic diffusions having locally Lipschitz matrix coefficients and singular
drifts on general open sets with absorption at the boundary. In this
application elliptic regularity results imply the desired regularity
assumptions
- âŠ